How many diopters does someone have?!
Question: to reach up to the point that a person cannot function without glasses or contact lenses
Answers: to reach up to the point that a person cannot function without glasses or contact lenses
Cannot function at what?
In the UK we've had a Home Secretary*, David Blunkett, who was totally blind. (How good he was at the job would take us over into politics. He also managed to have an affair with a married woman while in office... Functioning well and badly there, then.)
My Rx is in the range -7.00 to -13.50, (astigmatism and anisometropia!) and I've been known to do quite a few things without my RX.
I have prescription swimming goggles but I don't usually bother with them.
I can make breakfast without my glasses: I wouldn't swear I've always got my eyes open.
But then, no-one with an Rx over -0.75 should be driving without correction.
*US Secretary of State, nearest equivalent?
your question is con fussing --considering a defective eye vision the value of diopter starts with - or +.o.125to 25 ----normal eye has a power of 50 diopter--- also learn that persons with no error up to the age of 38 do not need glasses to wear--- based on refractive error you need glass